Table of Contents
How do you vacuum a transformer?
The following procedure is to be adopted:
- Connect the vacuum gauge to a suitable valve of the tank.
- Evacuate the transformer/ reactor tank until the pressure is below 50 mbar (5 kPa).
- Shut the vacuum valve and stop the pump.
- Wait for an hour and take a first vacuum reading – say P1.
Why is filtering of transformer oil needed?
Transformers require filtered and dried oil. During its usage, the insulating oil absorbs moisture and gets polluted by sopping fibers, dirty particles, aging products, and soot. Hence, transformer oil filtering is an important process which eliminates solid particles, dissolved gasses, and dissolved water.
Why are transformers placed in oil filled tanks?
It is corrosive, it conducts electricity, and has lower boiling point than oil. The transformer oil serves the cooling purpose in the transformer. The air cooling or other cooling methods have their limitations. The oil transfers the heat of the device rapidly.
Why nitrogen is used in transformer?
To put out the fire in a transformer, were it to occur, we can reduce the oxygen level by displacing it with nitrogen gas. The nitrogen pressure in the transformer also helps to reduce the top oil pressure and temperature which is critical for preventing an explosion.
Why transformer oil drums are kept in horizontal position?
Lay drums on their sides with the bungs in a horizontal (3 and 9 o’clock) position below the lubricant level. This will reduce the risk of the seals drying out and the ingestion of moisture caused by breathing.
What is purpose of filling transformer oil in tank of transformer enlist the properties of transformer oil?
Transformer oil is used in oil-filled electrical power transformers to insulate, stop arcing and corona discharge, and to dissipate the heat of the transformer (i.e. act as a coolant). Transformer oil is also used to preserve the transformer’s core and windings – as these are fully immersed inside the oil.
What is dew point in transformer?
Dew point is the temperature to which air must be cooled for water vapor in it to condense into dew or frost. This maximum amount is called water vapor saturation pressure.